Steam generating device

Abstract

The invention relates to steam generation equipment and discloses a steam generation device, a first heat exchanger is in a spiral coil pipe shape, the axis of the first heat exchanger is vertically arranged, a combustor is provided with an exhaust part used for exhausting fuel gas, and the exhaust part is in a columnar shape and is inserted into a space formed by spirals of the first heat exchanger. The exhaust portion of the combustor is arranged to be columnar and inserted into the space formed by the spiral of the first heat exchanger, the transverse size of the smoke channel can be effectively reduced, and therefore the occupied area of the steam generation device is reduced. When the combustor works, the open fire section of the exhaust part can directly bake the space formed by the spiral of the first heat exchanger, heating is faster and more uniform, and therefore the heat exchange efficiency of the first heat exchanger is effectively improved. And moreover, as the flue gas channel is relatively short, the heat loss in the flue gas recirculation process is less, and the heat exchange efficiency of the whole group of heat exchangers is further improved.

Description

Technical Field

[0001] The invention relates to steam generating equipment, in particular to a steam generating device. Background Art

[0002] The invention application document with publication number CN115539929A ​​discloses a mixed flow superheated steam generating device, which includes a burner, a flue gas channel, a heat exchanger, a water inlet pipe, a steam superheated evaporation device and a fan. The steam superheated evaporation device includes a steam collecting tank, a superheated heat exchanger, a water collecting tank and a plurality of heat exchange tube bundles. The upper and lower ends of the plurality of heat exchange tube bundles are respectively connected to the steam collecting tank and the water collecting tank. The heat exchanger, the plurality of heat exchange tube bundles and the superheated heat exchanger are located in the flue gas channel. The steam inlet end of the superheated heat exchanger is connected to the steam collecting tank. The steam outlet end of the superheated heat exchanger is provided with a steam outlet. Among them, the heat exchanger includes a first heat exchanger and a second heat exchanger.

[0003] When the invention is working, the pure water in the heat exchanger is converted into steam after heat exchange with the high-temperature flue gas. The steam enters the steam collecting tank. When the high-temperature flue gas flows through the heat exchange tube bundle and the outside of the superheat exchanger, the saturated steam in the superheat exchanger is heated into superheated steam, so that the superheated steam generated by the invention has a higher temperature, higher heat, less energy loss, and has a significant energy-saving effect.

[0004] In the steam generating device, the first heat exchanger, the steam superheat evaporation device and the second heat exchanger are arranged transversely in the flue gas channel in sequence. In particular, the first heat exchanger includes the first coil heat exchanger, the second coil heat exchanger, the third coil heat exchanger and the fin heat exchanger arranged in sequence in front and behind. This will increase the length of the flue gas channel, thereby increasing the floor space of the steam generating device. In addition, since the burner adopts a transverse flame heating method, the heat exchange efficiency of the front section of the first heat exchanger is high, while the heat exchange efficiency of the rear section is low. In addition, the flue gas channel itself is long, which will further reduce the heat exchange efficiency, thereby reducing the quality of the steam generated by the equipment, so there is still room for improvement. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a steam generating device, which can not only reduce the lateral space of the smoke channel and reduce the floor space of the equipment, but also effectively improve the heat exchange efficiency of the heat exchanger.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A steam generating device comprises a flue gas passage, a burner and a heat exchanger. The heat exchanger comprises a plurality of heat exchangers arranged in sequence in the flue gas passage. The heat exchanger located at the front end of the flue gas passage is defined as a first heat exchanger. The first heat exchanger is in the shape of a spiral coil and its axis is arranged vertically. The burner has an exhaust portion for exhausting fuel gas, and the exhaust portion is columnar and inserted into the space formed by the spiral of the first heat exchanger.

[0008] By adopting the above scheme, the exhaust part of the burner is set to be columnar and inserted into the space formed by the spiral of the first heat exchanger, which can effectively reduce the lateral volume of the smoke channel, thereby reducing the footprint of the steam generating device. When the burner is working, the open flame section of the exhaust part can directly bake the space formed by the spiral of the first heat exchanger, which not only heats faster but also heats more evenly, thereby effectively improving the heat exchange efficiency of the first heat exchanger. Furthermore, since the smoke channel is relatively short, the heat loss during the smoke recirculation process is less, thereby further improving the heat exchange efficiency of the entire heat exchanger.

[0009] Preferably, a steam collecting tank is further included. A water collecting tank is arranged below the first heat exchanger. At least one heat exchange tube bundle is arranged outside the first heat exchanger. The upper and lower ends of the heat exchange tube bundle are respectively connected to the steam collecting tank and the water collecting tank.

[0010] By adopting the above solution, the heat exchange tube bundle is arranged around the first heat exchanger, which can not only further reduce the horizontal space occupied by the steam generator, but also realize the open flame heating of the heat exchange tube bundle. Compared with the traditional flue gas heating, the heat exchange efficiency is higher, thereby further improving the steam quality of the steam generator. Since the water vapor mixture in the first heat exchanger is the part that needs heat the most, and the high-temperature saturated water in the heat exchange tube bundle is the part that needs heat the second most, the heat exchange tube bundle is arranged outside the first heat exchanger, which can maximize the use of the open flame heat generated by the burner, thereby further improving the heat exchange efficiency.

[0011] Preferably, the steam collecting tank is arranged directly above the first heat exchanger and a passage for the exhaust part to pass through is provided on the steam collecting tank.

[0012] By adopting the above solution, the steam collecting tank is arranged directly above the first heat exchanger, which can effectively reduce the length of the heat exchange tube bundle, thereby further reducing the volume of the flue gas channel, and make the entire steam generating device more compact, thereby improving the aesthetics.

[0013] Preferably, a connecting pipe extends above the channel for the exhaust gas portion to enter the channel and is used to fix the burner.

[0014] Preferably, the burner is fixed to the connecting pipe via a flange.

[0015] The above solution enables the burner to be fixed above the smoke channel. Compared with the traditional burner installed at the front end of the smoke channel, the external lateral space of the smoke channel can be further reduced, thereby reducing transportation costs.

[0016] Preferably, a plurality of exhaust holes for injecting fuel gas are distributed on the outer side wall of the exhaust portion.

[0017] By adopting the above solution, the gas can be uniformly ejected from the outer peripheral surface of the exhaust portion, further improving the heating efficiency and uniformity of the burner.

[0018] Preferably, the heat exchanger also includes a second heat exchanger, a third heat exchanger, a fourth heat exchanger and a fifth heat exchanger which are arranged in the flue gas channel and arranged in sequence behind the first heat exchanger. The fifth heat exchanger, the fourth heat exchanger, the third heat exchanger, the first heat exchanger and the second heat exchanger are connected end to end in sequence. The outlet of the second heat exchanger is connected to the inlet of the steam collecting tank, and the inlet of the fifth heat exchanger is connected to a water inlet pipe.

[0019] By adopting the above solution, the heat exchangers are arranged into multiple groups of heat exchangers, which can realize multi-stage heating of the water circuit of the equipment, thereby effectively improving the steam quality.

[0020] Preferably, the steam outlet of the steam collecting tank is connected to a superheat heat exchanger located between adjacent heat exchangers, and the steam outlet of the superheat heat exchanger is connected to a steam outlet.

[0021] By adopting the above scheme, the saturated steam in the superheater heat exchanger can be converted into superheated steam after heat exchange with the high-temperature flue gas, and then discharged through the steam outlet, thereby further improving the steam quality.

[0022] Preferably, a smoke exhaust port is provided at the rear end of the smoke passage.

[0023] By adopting the above solution, the smoke exhaust port can help the low-temperature smoke at the rear end of the smoke passage to be discharged smoothly, thereby keeping the smoke passage unobstructed.

[0024] The present invention has significant technical effects due to the adoption of the above technical solutions: the exhaust part of the burner is set to be columnar and plugged into the space formed by the spiral of the first heat exchanger, which can effectively reduce the lateral volume of the smoke channel, thereby reducing the footprint of the steam generating device. When the burner is working, the open flame section of the exhaust part can directly bake the space formed by the spiral of the first heat exchanger, which not only heats faster but also heats more evenly, thereby effectively improving the heat exchange efficiency of the first heat exchanger. Furthermore, since the smoke channel is relatively short, the heat loss during the smoke recirculation process is less, thereby further improving the heat exchange efficiency of the entire heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1The structure of this embodiment is shown in FIG. Figure 1 ;

[0026] Figure 2 The structure of this embodiment is shown in FIG. Figure 2 ;

[0027] Figure 3 The structure of this embodiment is shown in FIG. Figure 3 ;

[0028] Figure 4 The structure of this embodiment is shown in FIG. Figure 4 .

[0029] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Smoke channel; 2. Burner; 3. Steam collecting tank; 5. First heat exchanger; 6. Connecting pipe; 7. Exhaust part; 9. Second heat exchanger; 10. Third heat exchanger; 11. Fourth heat exchanger; 12. Fifth heat exchanger; 13. Water inlet pipe; 14. Water collecting tank; 15. Heat exchange tube bundle; 16. Superheat heat exchanger; 17. Steam outlet; 18. Smoke exhaust port; 19. Flange; 20. Water supply device. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] like Figures 1 to 4 As shown, a steam generating device disclosed in this embodiment includes a flue gas channel 1, a burner 2, a steam collecting tank 3 and a heat exchanger. Among them, the burner 2 is preferably a premixed ultra-low nitrogen bridge hole surface burner, and the heat exchanger is connected to the steam collecting tank 3 in sequence, and the heat exchanger includes a plurality of heat exchangers arranged in sequence in the flue gas channel 1. For the convenience of description, the heat exchanger located at the front end of the flue gas channel 1 is defined as the first heat exchanger 5, the first heat exchanger 5 is in the shape of a spiral coil and the axis is arranged vertically, the burner 2 has an exhaust portion 7 for discharging fuel gas, and the exhaust portion 7 is columnar and plugged into the space formed by the spiral of the first heat exchanger 5.

[0032] In order to further improve the steam quality and reduce the lateral space occupied by the equipment, the steam generating device also includes a steam collecting tank 3, a water collecting tank 14 is arranged below the first heat exchanger 5, and at least one vertical heat exchange tube bundle 15 is arranged on the outside of the first heat exchanger 5, and the upper and lower ends of the heat exchange tube bundle 15 are respectively connected to the steam collecting tank 3 and the water collecting tank 14.

[0033] In order to reduce the length of the heat exchange tube bundle 15 and improve the compactness of the equipment, the steam collecting tank 3 is arranged directly above the first heat exchanger 5 and a passage is provided on the steam collecting tank 3 for the exhaust part 7 to pass through. A connecting pipe 6 is extended above the passage for the exhaust part 7 to enter the passage and is used to fix the burner 2. The burner 2 is fixed to the connecting pipe 6 by a flange 19, thereby improving the connection strength and sealing of the burner 2 and the connecting pipe 6.

[0034] In order to improve the heating efficiency and uniformity of the burner 2, a plurality of exhaust holes for injecting fuel gas are evenly distributed on the outer wall of the exhaust portion 7.

[0035] In order to further improve the heat exchange efficiency of the heat exchanger, the heat exchanger also includes a second heat exchanger 9, a third heat exchanger 10, a fourth heat exchanger 11 and a fifth heat exchanger 12 which are arranged in the flue gas channel 1 and arranged in sequence behind the first heat exchanger 5. The fifth heat exchanger 12, the fourth heat exchanger 11, the third heat exchanger 10, the first heat exchanger 5 and the second heat exchanger 9 are connected end to end in sequence. The outlet of the second heat exchanger 9 is connected to the inlet of the steam collecting tank 3, and the inlet of the fifth heat exchanger 12 is connected to a water inlet pipe 13. The water inlet pipe 13 is connected to a water supply device 20, such as a water pump.

[0036] In order to further improve the steam quality and reduce the horizontal space occupied by the steam generating device, the steam outlet of the steam collecting tank 3 is connected to the superheat heat exchanger 16 located between the adjacent heat exchangers, and the steam outlet of the superheat heat exchanger 16 is connected to the steam outlet 17. The steam outlet 17 is located outside the flue gas channel 1, so as to facilitate the external steam use device (not shown).

[0037] In order to keep the smoke passage 1 unobstructed, a smoke exhaust port 18 is provided at the rear end of the smoke passage 1 .

[0038] The specific working principle is as follows:

[0039] When the steam generating device is in operation, the burner 2 is started, and its exhaust portion 7 generates open flame and high-temperature flue gas through the exhaust holes on the side wall, so as to bake the first heat exchanger 5 and the heat exchange tube bundle 15 at high temperature through the open flame, and at the same time heat all the heat exchangers behind the first heat exchanger 5 through the high-temperature flue gas, and finally the flue gas is discharged from the flue gas channel 1 through the exhaust port 18.

[0040] At the same time, pure water enters the water inlet pipe 13, the fifth heat exchanger 12, the fourth heat exchanger 11, the third heat exchanger 10, the first heat exchanger 5 and the second heat exchanger 9 in sequence through the water supply device 20. In this process, under the heat exchange effect of the open flame of the burner 2 and the high-temperature flue gas, the temperature of the water path gradually rises. When the water temperature reaches the vaporization temperature, the pure water begins to vaporize and forms saturated steam. Then, the saturated steam in the second heat exchanger 9 flows into the steam collecting tank 3, so that part of the steam condenses into high-temperature saturated water, and the high-temperature saturated water flows downward into the water collecting tank 14 through the heat exchange tube bundle 15. When there is too much high-temperature saturated water, the high-temperature saturated water will fill the water collecting tank 14 and multiple heat exchange tube bundles 15. At this time, the open flame generated by the burner 2 exchanges heat with the high-temperature saturated water in the heat exchange tube bundle 15, so that the high-temperature saturated water in the heat exchange tube bundle 15 is further evaporated and becomes saturated steam. After leaving the steam collecting tank 3 , the saturated steam enters the superheat heat exchanger 16 . Under the heating of the high-temperature flue gas, the saturated steam becomes superheated steam and is finally discharged through the steam outlet 17 .

Claims

1. A steam generating device, comprising a flue gas channel (1), a burner (2) and a heat exchanger, characterized in that: The heat exchanger comprises a plurality of heat exchangers arranged in sequence in a flue gas channel (1), wherein the heat exchanger located at the front end of the flue gas channel (1) is defined as a first heat exchanger (5), the first heat exchanger (5) is in the shape of a spiral coil and its axis is arranged vertically, the burner (2) has an exhaust portion (7) for exhausting the fuel gas, and the exhaust portion (7) is in the shape of a column and is inserted into a space formed by the spiral of the first heat exchanger (5).

2. A steam generating device according to claim 1, characterized in that: It also includes a steam collecting tank (3), a water collecting tank (14) is arranged below the first heat exchanger (5), at least one heat exchange tube bundle (15) is arranged outside the first heat exchanger (5), and the upper and lower ends of the heat exchange tube bundle (15) are respectively connected to the steam collecting tank (3) and the water collecting tank (14).

3. A steam generating device according to claim 2, characterized in that: The steam collecting tank (3) is arranged directly above the first heat exchanger (5) and a passage for the exhaust portion (7) to pass through is provided on the steam collecting tank (3).

4. A steam generating device according to claim 3, characterized in that: A connecting pipe (6) extends above the channel, through which an exhaust gas supply portion (7) enters the channel and is used to fix the burner (2).

5. A steam generating device according to claim 4, characterized in that: The burner (2) is fixed to the connecting pipe (6) via a flange (19).

6. A steam generating device according to any one of claims 1 to 5, characterized in that: The outer side wall of the exhaust portion (7) is provided with a plurality of exhaust holes for injecting fuel gas.

7. A steam generating device according to any one of claims 1 to 5, characterized in that: The heat exchanger also includes a second heat exchanger (9), a third heat exchanger (10), a fourth heat exchanger (11) and a fifth heat exchanger (12) which are arranged in the flue gas channel (1) and arranged in sequence behind the first heat exchanger (5); the fifth heat exchanger (12), the fourth heat exchanger (11), the third heat exchanger (10), the first heat exchanger (5) and the second heat exchanger (9) are connected end to end in sequence; the outlet of the second heat exchanger (9) is connected to the inlet of the steam collecting tank (3); and the inlet of the fifth heat exchanger (12) is connected to a water inlet pipe (13).

8. A steam generating device according to any one of claims 2 to 5, characterized in that: The steam outlet of the steam collecting tank (3) is connected to a superheating heat exchanger (16) located between adjacent heat exchangers, and the steam outlet of the superheating heat exchanger (16) is connected to a steam outlet (17).

9. A steam generating device according to any one of claims 1 to 5, characterized in that: A smoke exhaust port (18) is provided at the rear end of the smoke channel (1).

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